. The Canadian field-naturalist. 460 The Canadian Field-Naturalist Vol. 107. Figure 3. Striped Dolphins porpoising in the Mediterranean. Photo courtesy S. Leatherwood. Behaviour Groups of up to 3000 individuals have been reported off the coast of Japan (Nishiwaki 1975). Miyazaki and Nishiwaki (1978) examined 45 schools of Striped Dolphins off the coast of Japan between 1963 and 1973 and found that of schools had fewer than 500 individuals; the range was 8 to 2136 individuals. They also described three different types of schools, juvenile, adult, and mixed, to which Striped Dolphins belon
. The Canadian field-naturalist. 460 The Canadian Field-Naturalist Vol. 107. Figure 3. Striped Dolphins porpoising in the Mediterranean. Photo courtesy S. Leatherwood. Behaviour Groups of up to 3000 individuals have been reported off the coast of Japan (Nishiwaki 1975). Miyazaki and Nishiwaki (1978) examined 45 schools of Striped Dolphins off the coast of Japan between 1963 and 1973 and found that of schools had fewer than 500 individuals; the range was 8 to 2136 individuals. They also described three different types of schools, juvenile, adult, and mixed, to which Striped Dolphins belonged at different times according to their age and reproductive condi- tion. The average size of schools taken in the Japanese drive fisheries was 360 individuals (Nishiwaki 1975). From 114 sightings from the northeast coast of the United States, the mean esti- mated group size was , with a mode of 20, and a range from 1 to 500 individuals. In this area, Striped Dolphins were observed in the largest groups of all small cetacean species observed (CETAP 1982). Food items recorded include fish, squid, and shrimp; myctophid fishes and the shrimp Bentheogennema borealis were dominant in the stomach contents of 27 individuals taken off the coast of Japan (Miyazaki et al. 1973). Feeding on anchovies and sardines in the Mediterranean has been suggested (Di Natale 1979). Associations with seabirds, and at least nine other species of marine mammals, have been noted. These include Atlantic White-sided Dolphins (Lage- norhynchus acutus). Common Dolphins, Long- finned Pilot Whales (Globicephala melas), Risso's Dolphins (Grampus griseus), Bottlenose Dolphins {Tursiops truncatus), other species in the genus Stenella, Northern Bottlenose Whales, Sperm Whales (Physeter macrocephalus), and Minke Whales (Balaenoptera acutorostrata) (Table 1; CETAP 1982; Au and Pitman 1988). Au and Pitman (1988) note that associations with birds and other species of marine mammals occurred in seven and nine per
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